US3891791A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Communication cable with improved coated shield
Assignee: General Cable Corp
•
Filing: 1974-05-10
•
Granted: 1975-06-24
•
Expires: 1994-05-10
Abstract
Abstract This communication cable has a metal shield coated with a corrosion protecting coating of polyethylene blended with an adhesive copolymer to control the adhesion of the coating. A jacket is extruded directly over the outside of the coated shield and is uniformly bonded to the coated shield. The bond to the metal is strong enough to prevent delamination of the coating from the metal and the cable is buried and exposed to ground water; but the bond of the coating to the metal is limited enough to permit the coating on the outside of the shield to be peeled from the metal at cable ends and splices so as to expose bare metal.
Inventors
- 👤 Gertraud A Schmidt
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 17:54
CPC Classifications
H; H01; H01B; H01B11/00; H01B11/02; H01B11/06; H01B11/10; H01B11/1016
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
149 words
AN ELECTRIC COMMUNICATION CABLE COMPRISING A CABLE CORE, INSULATION ON THE CABLE CORE, A SHIELD OF CORROSIVE METAL AROUND THE CORE, A CORROSION PROTECTING COATING ON THE SHIELD INCLUDING A MIXTURE OF POLYETHYLENE AND AN ADHESIVE COPOLYMER, THE ADHESION OF THE MIXTURE TO THE METAL OF THE SHIELD BEING SUFFICIENTLY STRONG TO PREVENT DELAMINATION OF THE COATING AND THE SHIELD WHEN THE CABLE IS BURIED AND EXPOSED TO GROUND WATER, BUT THE ADHESION BEING LIMITED TO SUCH A VALUE THAT THE COATING CAN BE PEELED FROM THE SURFACE OF THE SHIELD WHEN AN EDGE OF THE COATING IS BROKEN LOOSE FROM THE METAL THE COATING CONTAINING SUFFICIENT ADHESIVE COPOLYMER TO REQUIRE A FORCE OF BETWEEN 1 AND 2.5 POUNDS TO SEPARATE A ONE INCH WIDE STRIP OF THE COATING FROM THE METAL SHIELD AT 10 INCHES PER MINUTE, AND THE MAXIMUM RATIO OF POLYETHYLENE TO COPOLYMER BEING ABOUT 4.5.
Claim 2
Dependent Claim
149 words
AN ELECTRIC COMMUNICATION CABLE COMPRISING A CABLE CORE, INSULATION ON THE CABLE CORE, A SHIELD OF CORROSIVE METAL AROUND THE CORE, A CORROSION PROTECTING COATING ON THE SHIELD INCLUDING A MIXTURE OF POLYETHYLENE AND AN ADHESIVE COPOLYMER, THE ADHESION OF THE MIXTURE TO THE METAL OF THE SHIELD BEING SUFFICIENTLY STRONG TO PREVENT DELAMINATION OF THE COATING AND THE SHIELD WHEN THE CABLE IS BURIED AND EXPOSED TO GROUND WATER, BUT THE ADHESION BEING LIMITED TO SUCH A VALUE THAT THE COATING CAN BE PEELED FROM THE SURFACE OF THE SHIELD WHEN AN EDGE OF THE COATING IS BROKEN LOOSE FROM THE METAL THE COATING CONTAINING SUFFICIENT ADHESIVE COPOLYMER TO REQUIRE A FORCE OF BETWEEN 1 AND 2.5 POUNDS TO SEPARATE A ONE INCH WIDE STRIP OF THE COATING FROM THE METAL SHIELD AT 10 INCHES PER MINUTE, AND THE MAXIMUM RATIO OF POLYETHYLENE TO COPOLYMER BEING ABOUT 4.5.
Claim 3
Dependent Claim
35 words
The communication cable described in claim 1 characterized by an outer jacket over the coated shield, the outer jacket being an extrudant applied directly to the corrosion protection coating on the outside of the shield.
Claim 4
Dependent Claim
32 words
The communication cable described in claim 2 characterized by the outer jacket being bonded to the coating on the shield by an adhesion less than that of the coating to the metal.
Claim 5
Dependent Claim
39 words
The communication cable described in claim 3 characterized by the outer jacket being polyethylene fusion bonded to the coating on the shield but with a bond strength less than that of the coating to the metal of the shield.
Claim 6
Dependent Claim
23 words
The communication cable described in claim 1 characterized by the copolymer being from the group consisting of ethylene-acrylic acid copolymer and ethylene-methacrylic copolymer.
Claim 7
Dependent Claim
33 words
The communication cable described in claim 5 characterized by the proportion of polyethylene and copolymer in the coating being a ratio of polyethylene to copolymer between 3 to 4 and 4 to 3.
Claim 8
Dependent Claim
70 words
The communication cable described in claim 1 characterized by the tensile strength of the coating being greater than the adhesion of the coating to the metal so that the coating can be peeled from the surface of the metal shield without breaking the peeled portion of the coating to which the peeling force is applied and without splitting the coating as it is pulled from the surface of the metal.
References Cited (Backward Citations)
US3211808A
Cited
US3379821A
Cited
US3534149A
Cited
US3622683A
Cited
US3551586A
Cited
US3679503A
Cited
US3586756A
Cited
US3766645A
Cited
US3703605A
Cited
US3681515A
Cited
US3787255A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-06-23 | 1978-12-23 | 1979-06-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-06-23 | 1982-12-23 | 1983-06-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-06-23 | 1986-12-23 | 1987-06-24 | $7700.00 | Window Closed / Lapsed |